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5. Peter Stubbe (1991-1994)
The German managed Thailand from 1991 to 1994 and was most remembered for winning the 1993 Southeast Asian (SEA) Games.
Stubbe also led Thailand to victory at the 1992 King’s Cup; however, he fell short at the continental level as Thailand finished bottom of Group B at the 1992 AFC Asian Cup with 2 draws and 1 loss.